LONDON (AP) — British agents oversaw the destruction of an unspecified number of the Guardian newspaper’s hard drives after the paper began publishing revelations from Edward Snowden’s leaks, the paper’s editor said Monday.

Alan Rusbridger made the claim in an opinion piece published on the Guardian’s website, saying that a pair of staffers from British eavesdropping agency GCHQ monitored the process in what he called “one of the more bizarre moments in the Guardian’s long history.”

He said the hard drives were torn apart in the basement of the Guardian’s north London office with “two GCHQ security experts overseeing the destruction ... just to make sure there was nothing in the mangled bits of metal which could possibly be of any interest to passing Chinese agents.”